Fri September 21, 2012 By: Manisha

if the repulsion is more in the non bondede pairs then the angle should also be me . then how is it like in water the angle is less where tere are two lone pairs?

Expert Reply
Fri September 21, 2012
Around the Oxygen atom in the water molecule are pieces: 2 hydrogen atoms and 2 pairs of extra valence electrons. Each piece repels each other piece, so they try to get as far away from each other as possible. The resulting geometry is called a tetrahedron (picture a 4-sided pyramid with a triangular base) with the oxygen at the center. When we draw the water molecule, usually we don't draw the 2 pairs of valence electrons, so the molecule looks like a V. 

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